Pediatric laryngitis cannot be detected by blood tests. In general, laryngitis can be diagnosed by patient history, clinical symptoms, and laryngoscopy. Laryngitis belongs to the respiratory tract infectious diseases. Patients with acute laryngitis may have hoarseness, cough, sputum, sore throat, etc. Laryngoscopy shows acute congestion and edema of the laryngeal mucosa and vocal cords. Routine blood tests may show increased white blood cells, neutrophil ratio, C-reactive protein, through the routine blood tests can reflect the systemic infection, but can not be based only on routine blood laryngitis diagnosis. It is recommended that children with the above symptoms should seek medical attention in time and be treated promptly after the diagnosis of laryngitis is made. Avoid shouting, avoid eating spicy and stimulating food, and maintain good habits.